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How did life evolve on Earth? The answer to this question can help us understand our past and prepare for our future. Although evolution provides credible and reliable answers, polls show that many people turn away from science, seeking other explanations with which they are more comfortable....more

The four main mountain ranges of Venus are named Maxwell Montes, Frejya Montes, Akna Montes, and Danu Montes. These are found on Ishtar Terra. Mountain ranges are formed by the folding and buckling of...more

This is an example of the cratered terrain on Venus. Venusian craters are a little unusual in that there is a large amount of impact melt around the crater. This means either that the temperature of the...more

This image clearly shows a channel where something once flowed. Without proper measurements, scientists can only guess what sort of liquid may have flowed through this channel. On Earth, such channels...more

Like Mars, there is no plate tectonics on the surface of Venus. The surface of Venus does not *seem* to have changed or moved in billions of years. Unlike the case of Mars, however, careful examination...more

This image of the surface of the Earth shows the North and South American continents, as well as the floor of the Pacific Ocean. As can be seen in the image, the ocean floor shows evidence of mid-ocean...more

The surface of Mars can be broken into two main regions: highlands and lowlands. The highlands are in the southern hemisphere (the bottom of the figure), and the lowlands are in the northern hemisphere...more

Alpha Regio and Ovda Regio are examples of what is known as a "Plateau Highland" of Venus. Among the volcanic features of Alpha Regio is Eve Mons. Unlike volcanic rises, plateau highlands have few volcanoes,...more